<!--
 - SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
 - SPDX-License-Identifier: AGPL-3.0-or-later
-->
<template>
	<div class="content-unsupported-browser guest-box">
		<NcEmptyContent>
			{{ t('core', 'This browser is not supported') }}
			<template #icon>
				<Web />
			</template>
			<template #action>
				<div>
					<h2>
						{{ t('core', 'Your browser is not supported. Please upgrade to a newer version or a supported one.') }}
					</h2>
					<NcButton class="content-unsupported-browser__continue" variant="primary" @click="forceBrowsing">
						{{ t('core', 'Continue with this unsupported browser') }}
					</NcButton>
				</div>

				<ul class="content-unsupported-browser__list">
					<h3>{{ t('core', 'Supported versions') }}</h3>
					<li v-for="browser in formattedBrowsersList" :key="browser">
						{{ browser }}
					</li>
				</ul>
			</template>
		</NcEmptyContent>
	</div>
</template>

<script>
import { translatePlural as n, translate as t } from '@nextcloud/l10n'
import { generateUrl, getRootUrl } from '@nextcloud/router'
import { agents } from 'caniuse-lite/dist/unpacker/agents.js'
import NcButton from '@nextcloud/vue/components/NcButton'
import NcEmptyContent from '@nextcloud/vue/components/NcEmptyContent'
import Web from 'vue-material-design-icons/Web.vue'
import logger from '../logger.js'
import { supportedBrowsers } from '../services/BrowsersListService.js'
import browserStorage from '../services/BrowserStorageService.js'
import { browserStorageKey } from '../utils/RedirectUnsupportedBrowsers.js'

logger.debug('Supported browsers', { supportedBrowsers })

export default {
	name: 'UnsupportedBrowser',
	components: {
		Web,
		NcButton,
		NcEmptyContent,
	},

	computed: {
		isMobile() {
			return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)
		},

		/**
		 * Filter out or include mobile/desktop browsers depending
		 * on the current user platform/device
		 */
		filteredSupportedBrowsers() {
			return supportedBrowsers.filter((browser) => {
				if (!browser) {
					return false
				}

				if (this.isMobile) {
					return this.isMobileBrowser(browser)
				}
				return !this.isMobileBrowser(browser)
			})
		},

		formattedBrowsersList() {
			const list = {}

			// supportedBrowsers is generated by webpack at compilation time
			this.filteredSupportedBrowsers.forEach((browser) => {
				const [id, version] = browser.split(' ')
				if (!list[id] || list[id] < parseFloat(version, 10)) {
					list[id] = parseFloat(version, 10)
				}
			})

			return Object.keys(list).map((id) => {
				if (!agents[id]?.browser) {
					return null
				}

				const version = list[id]
				const name = agents[id]?.browser
				return this.t('core', '{name} version {version} and above', {
					name, version,
				})
			}).filter((entry) => entry !== null)
		},
	},

	methods: {
		t,
		n,

		// Set the flag allowing this browser and redirect to home
		forceBrowsing() {
			browserStorage.setItem(browserStorageKey, true)

			// Redirect if there is the data
			const urlParams = new URLSearchParams(window.location.search)
			if (urlParams.has('redirect_url')) {
				let redirectPath = Buffer.from(urlParams.get('redirect_url'), 'base64').toString() || '/'

				// remove index.php and double slashes
				redirectPath = redirectPath
					.replace('index.php', '')
					.replace(getRootUrl(), '')
					.replace(/\/\//g, '/')

				// if we have a valid redirect url, use it
				if (redirectPath.startsWith('/')) {
					window.location = generateUrl(redirectPath)
					return
				}
			}

			// else redirect to root
			window.location = generateUrl('/')
		},

		/**
		 * Detect if the browserslist browser is a mobile one
		 * https://github.com/browserslist/browserslist#query-composition
		 *
		 * @param {string} browser a valid browserlist browser. e.g `and_chr 90`
		 */
		isMobileBrowser(browser) {
			browser = browser.toLowerCase()
			return browser.includes('and_')
				|| browser.includes('android')
				|| browser.includes('ios_')
				|| browser.includes('mobile')
				|| browser.includes('_mob')
				|| browser.includes('samsung')
		},
	},
}
</script>

<style lang="scss" scoped>
$spacing: 30px;

.content-unsupported-browser {
	display: flex;
	justify-content: center;
	width: 400px;
	max-width: calc(90vw - 2 * $spacing);
	margin: auto;
	padding: $spacing;

	.empty-content {
		margin: 0;

		:deep(.empty-content__icon) {
			opacity: 1;
		}
	}

	&__continue {
		display: block;
		margin: $spacing auto;
	}

	&__list {
		margin-top: 2 * $spacing;
		margin-bottom: $spacing;
		li {
			text-align: start;
		}
	}
}

</style>
